Yucaipa Avenue Extension CA-SBR-1000. Davis, O.K., 1995.
Tilia II ASCII file yucapai2.txt

Davis, O.K. 1995.
Pollen Analysis of the Yucaipa Avenue Extension CA-SBR-1000. Report Submitted
to Donn R. Grenda, Statistical Research, Redlands, CA 92373. 15 p.

Routine pollen analysis was performed for 12 sediment samples from site CA SBR-1000 (34o N, 117o 5' W, elev. 704 m), San Bernardino County, California. In stratigraphic section, the pollen concentration gradually decreases and the pollen deterioration increases with increasing depth. The pollen of exotic Erodium cicutarium (filaree) is 10% of the pollen sum at 10-15 cm depth. Other pollen types abundant in surface sediment include ragweed (Ambrosia), mustard (Cruciferae), buckwheat (Eriogonum), and the dung fungus Sporormiella. The occurrence of Erodium cicutarium at depth indicates mixing of the sediment to a depth of at least 86 cm, and a young age for CA-SBR-1000. The increase of the pollen of weeds toward the surface is matched by a decline in the percentage of Liguliflorae, a taxon that was more important in the prehistoric grassland. The pollen of wetland taxa are more common below 50 cm than at the surface, probably indicating decreased development of riparian vegetation along Chicken Springs Wash, near the site. Samples associated with specific archaeological features have pollen percentages generally similar to those of the stratigraphic profile, but with higher pollen concentration, and charcoal percentages. The general lack of ethnographic indicators suggest that site occupation was neither intensive nor permanent.